Abstract
The sensitivity of the inverse problem of recovering epicardial potentials from body surface data to variations in geometry and conductivity parameters was investigated using an idealized, analytic model of the heart-torso system. The following areas were studied: (1) the ability to recover separate, local electrical events on the epicardium, (2) sensitivity to variations in the conductivity of various torso tissue layers, (3) the effect of elimination of the torso-air boundary (the infinite medium assumption), (4) the effect of uncertainties in heart position, and (5) the effect of uncertainties in heart size. It was found that the lung and surface muscle inhomogeneities should be included to retain the accuracy of the recovered epicardial potentials. Errors in amplitude and resolution are greater for posterior regions of the heart. The inverse procedure is very sensitive to inaccuracies in the geometrical parameters of heart position and size.
| Original language | English |
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| Pages | 1282-1286 |
| Number of pages | 5 |
| State | Published - 1985 |